Dry pressure gauges are most suitable for environments that do not consider mechanical vibrations, while Glycerine-filled manometers are most suitable for measuring pressure points with high stress, such as rapid and frequent loads, pressure peaks, and mechanical vibrations. In other words, if the system is expected to change pressure quickly or frequently, it is best to use a liquid-filled pressure gauge.
A glycerine-filled manometer has many advantages. This animation shows how the consistency of the liquid absorbs vibrations and pressure spikes. Under conditions of rapid dynamic load and vibration, this damping effect of the liquid provides easy readability.
The pressure gauge manufacturer's gauges are filled with 99.9% glycerin. Glycerin is non-toxic, biodegradable, and harmless to water. When the temperature drops to +17 °C, the glycerin starts to become viscous. As the temperature drops further, the glycerin becomes more viscous and causes the pointer to move to the correct position more slowly. At -5°C, these meters can no longer operate.